Starting device for chain saw

Abstract

The utility model discloses a starting device for a chain saw, which comprises a protective shell, a driving component and a ratchet component, the protective shell is provided with a connecting shaft, the connecting shaft is in threaded connection with the protective shell, the driving component is sleeved on the connecting shaft and rotates around the connecting shaft, and the ratchet component is sleeved on the connecting shaft and rotates around the connecting shaft. The ratchet wheel assembly is connected with the driving assembly, the driving assembly drives the ratchet wheel assembly to rotate, the structural design is ingenious and reasonable, practicability is high, accurate positioning and installation of the driving assembly and the ratchet wheel assembly are achieved through the connecting shaft, the connecting shaft and the protective shell are in threaded connection, and installation between the connecting shaft and the protective shell is facilitated; therefore, replacement between the connecting shaft and the protective shell is facilitated, the number of parts is reduced, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chain saw technical field especially relates to a starting device for chain saw. BACKGROUND

[0002] In the forestry, horticulture and related outdoor operation field, chain saw as a kind of efficient, convenient power tool is widely used in tree felling, branch pruning and other operations. The starting performance of chain saw is directly related to its use convenience and work efficiency, so the starting device is an important part of chain saw.

[0003] The connecting mode between the connecting shaft and the protective shell of the traditional chain saw starting device is often relatively complex, such as connecting the protective shell and the connecting shaft by additional fasteners, such as bolts, nuts and the like. This connecting mode not only increases the installation steps and the number of parts, resulting in the rise of production cost, on the other hand, when the connecting shaft is worn or the protective shell needs to be replaced, it is troublesome to disassemble and replace, resulting in the rise of production cost and the complexity of installation and replacement. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the above-mentioned technical problems existing in the prior art, providing a starting device for chain saw, which is clever and reasonable in structure design, strong in practicality, the connecting shaft realizes accurate positioning and installation of the driving assembly and the ratchet assembly, the connecting shaft and the protective shell are screw-connected, the installation between the connecting shaft and the protective shell is facilitated, so that the replacement between the connecting shaft and the protective shell is facilitated, the number of parts is reduced, and the production cost is reduced.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A starting device for chain saw, comprising a protective shell, a driving assembly and a ratchet assembly, the protective shell is provided with a connecting shaft, the connecting shaft is screw-connected with the protective shell, the driving assembly is sleeved on the connecting shaft, the driving assembly rotates around the connecting shaft, the ratchet assembly is sleeved on the connecting shaft, the ratchet assembly rotates around the connecting shaft, the ratchet assembly is connected with the driving assembly, the driving assembly drives the ratchet assembly to rotate, which is clever and reasonable in structure design, strong in practicality, the connecting shaft realizes accurate positioning and installation of the driving assembly and the ratchet assembly, the connecting shaft and the protective shell are screw-connected, the installation between the connecting shaft and the protective shell is facilitated, so that the replacement between the connecting shaft and the protective shell is facilitated, the number of parts is reduced, and the production cost is reduced.

[0007] The driving assembly comprises a pulling handle, a traction rope, a driving wheel and a connecting piece, the pulling handle is connected with the traction rope, the other end of the traction rope is connected with the driving wheel, the driving wheel is sleeved on the connecting shaft and rotates around the connecting shaft, the driving wheel is provided with a connecting cavity, the connecting piece is clamped in the connecting cavity and rotates synchronously with the driving wheel, and the other side of the connecting piece is clamped with the ratchet wheel assembly.

[0008] The driving wheel is provided with a traction groove, the traction groove is provided with a limiting slot, the traction rope is wound in the traction groove, one end of the traction rope is limited in the limiting slot, the connecting cavity is provided with a clamping slot, the connecting piece is provided with a clamping column and a protruding part, the connecting piece is clamped in the clamping slot through the clamping column, and the protruding part is clamped in the ratchet wheel assembly.

[0009] Further comprising a reset coil spring, the reset coil spring is installed in the protection shell, one end of the reset coil spring is limited on the protection shell, and the other end of the reset coil spring is connected with the driving wheel.

[0010] The ratchet wheel assembly comprises a ratchet wheel seat, a ratchet wheel and a driving torsion spring, the ratchet wheel seat and the ratchet wheel are both sleeved on the connecting shaft, the ratchet wheel seat is provided with a mounting cavity, the ratchet wheel and the driving torsion spring are both installed in the mounting cavity, the ratchet wheel seat is provided with a limiting slot one, the ratchet wheel is provided with a limiting slot two, and the two ends of the driving torsion spring are respectively limited in the limiting slot one and the limiting slot two.

[0011] One side of the ratchet wheel seat is provided with a connecting part one, the connecting part one is connected with the driving assembly, the connecting part one is provided with a clamping groove, the ratchet wheel seat is clamped with the driving assembly through the clamping groove, the ratchet wheel seat is further provided with a cover plate, the ratchet wheel seat and the cover plate are correspondingly provided with fixing holes, and the ratchet wheel seat and the cover plate are fixedly connected through the fixing holes.

[0012] Further comprising a pawl and a clamping spring, the pawl is installed on the ratchet wheel, the ratchet wheel is provided with a limiting clamping groove, one end of the pawl is rotatably installed in the limiting clamping groove, one end of the connecting shaft is provided with a limiting ring groove, the clamping spring is clamped and limited in the limiting ring groove, a protruding column is arranged on the pawl, adjusting gaps are arranged on both sides of the clamping spring, the protruding column is located in the adjusting gap, and a limiting groove section is arranged on the adjusting gap.

[0013] The driving assembly and the ratchet wheel seat and the clamping spring and the ratchet wheel are both provided with a gasket, and the gasket is sleeved on the connecting shaft.

[0014] The protection shell comprises a shell one and a shell two, the shell two is clamped in the shell one, the shell one is provided with a clamping hole one and a clamping hole two, the shell two is correspondingly provided with a clamping part one and a clamping part two, the clamping part one is clamped in the clamping hole one, and the clamping part two is clamped in the clamping hole two.

[0015] The shell one is provided with a threaded hole, the connecting shaft is provided with a threaded part, the connecting shaft is threadedly connected in the threaded hole through the threaded part, a butt joint part is arranged between the threaded part and the connecting shaft, and the butt joint part abuts against the shell one.

[0016] The utility model discloses a have following beneficial effect because of adopting above -mentioned technical scheme,

[0017] The utility model discloses a protective shell is equipped with connecting shaft, and connecting shaft is screwed with protective shell, and drive assembly is sleeved on connecting shaft, and drive assembly rotates around connecting shaft, and ratchet wheel assembly is sleeved on connecting shaft, and ratchet wheel assembly rotates around connecting shaft, and ratchet wheel assembly is connected with drive assembly, and drive assembly drives ratchet wheel assembly to rotate, and the structure design is ingenious and reasonable, and the practicality is strong, and connecting shaft realizes accurate positioning and installation of drive assembly and ratchet wheel assembly, and connecting shaft and protective shell are equipped as threaded connection between, and the installation between connecting shaft and protective shell is convenient, thereby the replacement between connecting shaft and protective shell is convenient, and the number of parts is reduced, and production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model makes further explanation from the following combined with the drawing:

[0019] Figure 1 It is structural diagram of the utility model a chain saw starting device for;

[0020] Figure 2 It is the utility model Figure 1 Sectional view;

[0021] Figure 3 It is the utility model drive assembly and ratchet wheel assembly's explosion map;

[0022] Figure 4 It is the utility model drive assembly and ratchet wheel assembly's structural diagram;

[0023] Figure 5 It is the utility model drive wheel's structural diagram;

[0024] Figure 6 It is the utility model connecting piece's structural diagram;

[0025] Figure 7 It is the utility model ratchet wheel seat and drive torsional spring's structural diagram;

[0026] Figure 8 It is the utility model ratchet wheel seat's structural diagram;

[0027] Figure 9 It is the utility model ratchet wheel, pawl and clasp spring's structural diagram;

[0028] Figure 10 It is the utility model ratchet wheel's structural diagram;

[0029] Figure 11 It is the utility model connecting shaft and clasp spring's structural diagram;

[0030] Figure 12 It is the structure schematic view of the protective shell body in the utility model;

[0031] Figure 13 It is the structure schematic view of the shell body one in the utility model;

[0032] Figure 14 It is the structure schematic view of the shell body two in the utility model;

[0033] Figure 15 It is the structure schematic view of the utility model on the chain saw;

[0034] Figure 16 It is the structure schematic view of the chain saw hides the drive arrangement behind.

[0035] In the drawing: 1-protective shell body;11-shell body one;12-shell body two;13-connection hole one;14-connection hole two;15-connection part one;16-connection part two;17-screw hole;

[0036] 2-connection shaft;21-limit ring groove;22-screw part;23-abutment part;

[0037] 3-drive assembly;31-pull handle;32-drive wheel;33-connection piece;34-connection cavity;35-pulling groove;36-limit slot;37-connection slot;38-connection column;39-protruding part;

[0038] 4-ratchet assembly;41-ratchet seat;411-installation cavity;412-limit slot one;413-connection part one;414-connection slot;415-cover plate;42-ratchet wheel;421-limit slot two;422-limit connection slot;43-drive torsional spring;44-fixing hole;45-pawl;451-protruding column;46-connection spring;461-adjustment gap;462-limit slot section;5-reset coil spring;6-gasket;7-flywheel;8-rotary tooth groove. Specific implementation

[0039] As Figures 1 to 16 Shown, it is a kind of starting device for chain saw of the utility model, including protective shell body 1, drive assembly 3 and ratchet assembly 4, protective shell body 1 is equipped with connection shaft 2, connection shaft 2 is connected with protective shell body 1 by screw thread, drive assembly 3 is set on connection shaft 2, drive assembly 3 rotates around connection shaft 2, ratchet assembly 4 is set on connection shaft 2, ratchet assembly 4 rotates around connection shaft 2, ratchet assembly 4 is connected with drive assembly 3, drive assembly 3 drives ratchet assembly 4 to rotate, structure design is ingenious and reasonable, and practicality is strong, connection shaft 2 realizes accurate positioning and installation of drive assembly 3 and ratchet assembly 4, connection shaft 2 and protective shell body 1 are connected by screw thread, the installation between connection shaft 2 and protective shell body 1 is facilitated, so that the replacement between connection shaft 2 and protective shell body 1 is facilitated, reduce the number of parts, reduce production cost.

[0040] The driving assembly 3 comprises a pulling handle 31, a traction rope (not shown in the figure), a driving wheel 32 and a connecting piece 33, the pulling handle 31 is connected with the traction rope, the other end of the traction rope is connected with the driving wheel 32, specifically, the driving wheel 32 is provided with a traction groove 35, the traction groove 35 is provided with a limiting slot 36, the traction rope is wound in the traction groove 35, and one end of the traction rope is limited in the limiting slot 36; the driving wheel 32 is sleeved on the connecting shaft 2 and rotates around the connecting shaft 2; the driving wheel 32 is provided with a connecting cavity 34, the connecting piece 33 is clamped in the connecting cavity 34, the connecting cavity 34 is provided with a clamping slot 37, the connecting piece 33 is provided with a clamping column 38, and the connecting piece 33 is clamped in the clamping slot 37 through the clamping column 38, so that the connecting piece 33 is in synchronous rotation connection with the driving wheel 32; the other side of the connecting piece 33 is clamped with the ratchet seat 41 in the ratchet assembly 4.

[0041] The ratchet assembly 4 comprises a ratchet seat 41, a ratchet 42 and a driving torsional spring 43, the ratchet seat 41 and the ratchet 42 are both sleeved on the connecting shaft 2, the ratchet seat 41 is provided with a mounting cavity 411, and the ratchet 42 and the driving torsional spring 43 are both mounted in the mounting cavity 411; the ratchet seat 41 is provided with a limiting slot one 412, the ratchet 42 is provided with a limiting slot two 421, and the two ends of the driving torsional spring 43 are respectively limited in the limiting slot one 412 and the limiting slot two 421; the driving torsional spring 43 forms a stable transmission connection; the driving torsional spring is used for energy storage, when the energy storage reaches a certain degree, the force of the end of the driving torsional spring in contact with the ratchet 42 is large enough, the ratchet 42 is driven to rotate by the ratchet pawl 45 in cooperation with the snap spring 46, the flywheel 7 is rotated, and the starting of the engine is realized; the ratchet seat 41 is provided with a cover plate 415, the ratchet seat 41 and the cover plate 415 are correspondingly provided with fixing holes 44, the ratchet seat 41 and the cover plate 415 are fixedly connected through the fixing holes 44, assembly is convenient, the cover plate 415 can be conveniently disassembled, the driving torsional spring in the mounting cavity 411 can be conveniently mounted and dismounted, and the cover plate 415 can also play a certain protection role.

[0042] One side of the ratchet seat 41 is provided with a connecting part one 413, the connecting part one 413 is connected with the driving wheel 32 in the driving assembly 3, specifically, the connecting part one 413 is inserted into the connecting cavity 34 of the driving wheel 32, meanwhile, the connecting part one 413 is provided with a clamping groove 414, the connecting piece 33 is provided with a protruding part 39, the connecting piece 33 is clamped in the clamping groove 414 through the protruding part 39, so that the clamping of the ratchet assembly 4 and the driving assembly 3 is realized, and in the utility model, the connecting piece 33 is located between the ratchet seat 41 and the driving wheel 32.

[0043] The driving wheel 32 of the driving assembly 3 and the ratchet seat 41 and the snap spring 46 and the ratchet 42 are all provided with a gasket 6, the gasket 6 is sleeved on the connecting shaft 2, and the setting of the gasket 6 can improve the structural stability and reliability of the starting device after assembly.

[0044] The ratchet wheel assembly 4 further comprises two pawls 45 and a snap spring 46, the two pawls 45 are symmetrically arranged on the ratchet wheel 42, the ratchet wheel 42 is provided with a limiting clamping groove 422, one end of the pawl 45 is rotatably arranged in the limiting clamping groove 422, one end of the connecting shaft 2 is provided with a limiting ring groove 21, the snap spring 46 is clamped in the limiting ring groove 21, and in the initial state, one side of the pawl 45 is attached to the corresponding side surface of the boss at the center of the ratchet wheel 42, so that the pawl 45 can only rotate in one direction, and the one-way rotation can ensure the stability and reliability of the starting process, in the rotation of the ratchet wheel 42, the two pawls 45 are limited on the ratchet wheel 42 and intermittently rotate, the flywheel 7 of the chain saw is provided with a rotating tooth groove 8, and the pawl 45 is clamped into the rotating tooth groove 8 in the process of rotation, thereby driving the flywheel 7 to rotate, the structure is compact and reasonable, the limiting ring groove 21 is used for clamping installation of the snap spring 46, the design is ingenious, installation and dismounting are convenient, and subsequent maintenance and replacement are also facilitated.

[0045] The pawl 45 is provided with a protruding column 451, the snap spring 46 is provided with adjusting gaps 461 on both sides, the protruding column 451 is located in the adjusting gap 461, and the adjusting gap 461 is provided with a limiting groove section 462; when the ratchet wheel 42 rotates, the protruding column 451 on the pawl 45 gradually moves into the limiting groove section 462 and abuts against the end side wall of the limiting groove section 462; when the ratchet wheel 42 continues to rotate, the pawl 45 intermittently rotates on the ratchet wheel 42 due to the abutting limitation of the limiting groove section 462 on the protruding column 451.

[0046] In the utility model, the reset coil spring 5 is further arranged in the protective shell 1, one end of the reset coil spring 5 is limited on the protective shell 1, the other end of the reset coil spring 5 is connected with the driving wheel 32, the handle pulls the traction rope, the traction rope drives the driving wheel 32 to rotate, the driving wheel 32 drives the ratchet wheel seat 41 to rotate, the ratchet wheel seat 41 drives the ratchet wheel 42 to rotate through the driving coil spring, the ratchet wheel 42 realizes the starting of the engine through the cooperation of the pawl 45 and the snap spring 46, and the driving wheel 32 also pulls the reset coil spring 5 to store energy; after the starting is completed, the driving wheel 32 is reset under the action of the reset coil spring 5, so that the traction rope is recycled.

[0047] The protective shell 1 comprises a shell one 11 and a shell two 12, the shell two 12 is clamped in the shell one 11, the shell one 11 is provided with a clamping hole one 13 and a clamping hole two 14, the shell two 12 is correspondingly provided with a clamping part one 15 and a clamping part two 16, the clamping part one 15 is clamped in the clamping hole one 13, and the clamping part two 16 is clamped in the clamping hole two 14; through the clamping mode, the installation between the shell one 11 and the shell two 12 is facilitated, and the structure is simple and convenient to operate.

[0048] The shell one 11 is provided with a threaded hole 17, the connecting shaft 2 is provided with a threaded part 22, the connecting shaft 2 is connected in the threaded hole 17 through the threaded part 22 to realize the threaded connection between the connecting shaft 2 and the protective shell 1, the threaded part 22 is provided with an abutting part 23 with the connecting shaft 2, the abutting part 23 abuts with the shell one 11, through the design of the abutting part 23, the accuracy when the connecting shaft 2 is connected with the shell one 11 is ensured, and the looseness caused by not connecting in place is avoided.

[0049] The above is only a specific embodiment of the present application, but the technical features of the present application are not limited to this. Any simple change, equivalent replacement or modification made on the basis of the present application to solve the same technical problem and achieve the same technical effect is included in the protection scope of the present application.

Claims

1. A starting device for a chain saw, characterized in that Include: Protective shell, the protective shell is equipped with connecting shaft, the connecting shaft is connected with the protective shell screw; Drive assembly, the drive assembly is sleeved on the connecting shaft, the drive assembly rotates around the connecting shaft; Ratchet assembly, the ratchet assembly is sleeved on the connecting shaft, the ratchet assembly rotates around the connecting shaft, the ratchet assembly is connected with the drive assembly, and the drive assembly drives the ratchet assembly to rotate.

2. A starting device for a chain saw as defined in claim 1, characterized in that The drive assembly includes a pulling handle, a traction rope, a drive wheel and a connecting piece, the pulling handle is connected with the traction rope, one end of the traction rope is connected with the drive wheel, the drive wheel is sleeved on the connecting shaft, the drive wheel rotates around the connecting shaft, the drive wheel is provided with a connecting cavity, the connecting piece is clamped in the connecting cavity, the connecting piece rotates synchronously with the drive wheel, and the other side of the connecting piece is clamped with the ratchet assembly.

3. A starting device for a chain saw as defined in claim 2, characterized in that The drive wheel is provided with a traction groove, the traction groove is provided with a limiting notch, the traction rope is wound in the traction groove, and one end of the traction rope is limited in the limiting notch; The connecting cavity is provided with a clamping notch, the connecting piece is provided with a clamping column and a protruding portion, the connecting piece is clamped in the clamping notch through the clamping column, and the protruding portion is clamped in the ratchet assembly.

4. A starting device for a chain saw as defined in claim 2, characterized in that It also includes a reset coil spring, the reset coil spring is installed in the protective shell, one end of the reset coil spring is limited on the protective shell, and the other end of the reset coil spring is connected with the drive wheel.

5. The starting device of claim 1, wherein: The ratchet assembly includes a ratchet seat, a ratchet and a drive torsion spring, the ratchet seat and the ratchet are both sleeved on the connecting shaft, the ratchet seat is provided with a mounting cavity, the ratchet and the drive torsion spring are both installed in the mounting cavity, the ratchet seat is provided with a limiting groove one, the ratchet is provided with a limiting groove two, and the drive torsion spring is limited in the limiting groove one and the limiting groove two.

6. A starting device for a chain saw as defined in claim 5, characterized in that One side of the ratchet seat is provided with a connecting part one, the connecting part one is connected with the drive assembly, the connecting part one is provided with a clamping groove, and the ratchet seat is clamped with the drive assembly through the clamping groove; The ratchet seat is also provided with a cover plate, the ratchet seat and the cover plate are provided with fixed holes correspondingly, and the ratchet seat and the cover plate are fixedly connected through the fixed holes.

7. A starting device for a chain saw as defined in claim 5, characterized in that It also includes a pawl and a clasp spring, the pawl is installed on the ratchet, the ratchet is provided with a limiting clamping groove, one end of the pawl is rotatably installed in the limiting clamping groove, one end of the connecting shaft is provided with a limiting ring groove, and the clasp spring is limitedly clamped in the limiting ring groove. The pawl is provided with a protruding column, the clasp spring is provided with adjusting gaps on both sides, the protruding column is located in the adjusting gap, and a limiting groove section is arranged on the adjusting gap.

8. A starting device for a chain saw as defined in claim 7, characterized in that The drive assembly and the ratchet seat and the clasp spring and the ratchet are both provided with a gasket, and the gasket is sleeved on the connecting shaft.

9. The starting device of claim 1, wherein: The protective shell comprises a shell one and a shell two, the shell two is clamped in the shell one, the shell one is provided with a clamping hole one and a clamping hole two, the shell two is correspondingly provided with a clamping part one and a clamping part two, the clamping part one is clamped in the clamping hole one, and the clamping part two is clamped in the clamping hole two.

10. A starting device for a chain saw as defined in claim 9, characterized in that The shell one is provided with a threaded hole, the connecting shaft is provided with a threaded part, the connecting shaft is screwed in the threaded hole through the threaded part, and an abutting portion is arranged between the threaded part and the connecting shaft. The abutting portion abuts against the shell one.

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